DESCRIPTION

[TRL]
The posix_trace_attr_getlogsize() function shall copy the log size, in bytes, from the log-max-size attribute of the
attributes object pointed to by the attr argument into the variable pointed to by the logsize argument. This log size
is the maximum total of bytes that shall be allocated for system and user trace events in the trace log. The default value for the
log-max-size attribute is implementation-defined.

The posix_trace_attr_setlogsize() function shall set the maximum allowed size, in bytes, in the log-max-size
attribute of the attributes object pointed to by the attr argument, using the size value supplied by the logsize
argument.

The trace log size shall be used if the log-full-policy attribute is set to POSIX_TRACE_LOOP or POSIX_TRACE_UNTIL_FULL.
If the log-full-policy attribute is set to POSIX_TRACE_APPEND, the implementation shall ignore the log-max-size
attribute.

The posix_trace_attr_getmaxdatasize() function shall copy the maximum user trace event data size, in bytes, from the
max-data-size attribute of the attributes object pointed to by the attr argument into the variable pointed to by the
maxdatasize argument. The default value for the max-data-size attribute is implementation-defined.

The posix_trace_attr_getmaxsystemeventsize() function shall calculate the maximum memory size, in bytes, required to
store a single system trace event. This value is calculated for the trace stream attributes object pointed to by the attr
argument and is returned in the variable pointed to by the eventsize argument.

The values returned as the maximum memory sizes of the user and system trace events shall be such that if the sum of the maximum
memory sizes of a set of the trace events that may be recorded in a trace stream is less than or equal to the
stream-min-size attribute of that trace stream, the system provides the necessary resources for recording all those trace
events, without loss.

The posix_trace_attr_getmaxusereventsize() function shall calculate the maximum memory size, in bytes, required to store
a single user trace event generated by a call to posix_trace_event() with
a data_len parameter equal to the data_len value specified in this call. This value is calculated for the trace
stream attributes object pointed to by the attr argument and is returned in the variable pointed to by the eventsize
argument.

The posix_trace_attr_getstreamsize() function shall copy the stream size, in bytes, from the stream-min-size
attribute of the attributes object pointed to by the attr argument into the variable pointed to by the streamsize
argument.

This stream size is the current total memory size reserved for system and user trace events in the trace stream. The default
value for the stream-min-size attribute is implementation-defined. The stream size refers to memory used to store trace
event records. Other stream data (for example, trace attribute values) shall not be included in this size.

The posix_trace_attr_setmaxdatasize() function shall set the maximum allowed size, in bytes, in the max-data-size
attribute of the attributes object pointed to by the attr argument, using the size value supplied by the maxdatasize
argument. This maximum size is the maximum allowed size for the user data argument which may be passed to posix_trace_event(). The implementation shall be allowed to truncate data passed
to trace_user_event which is longer than maxdatasize.

The posix_trace_attr_setstreamsize() function shall set the minimum allowed size, in bytes, in the stream-min-size
attribute of the attributes object pointed to by the attr argument, using the size value supplied by the streamsize
argument.

RETURN VALUE

Upon successful completion, these functions shall return a value of zero. Otherwise, they shall return the corresponding error
number.

[TRL]
The posix_trace_attr_getlogsize() function stores the maximum trace log allowed size in the object pointed to by
logsize, if successful.

The posix_trace_attr_getmaxdatasize() function stores the maximum trace event record memory size in the object pointed to
by maxdatasize, if successful.

The posix_trace_attr_getmaxsystemeventsize() function stores the maximum memory size to store a single system trace event
in the object pointed to by eventsize, if successful.

The posix_trace_attr_getmaxusereventsize() function stores the maximum memory size to store a single user trace event in
the object pointed to by eventsize, if successful.

The posix_trace_attr_getstreamsize() function stores the maximum trace stream allowed size in the object pointed to by
streamsize, if successful.